Headache experienced in both upright and recumbent postures, caused by and occurring within four days of an intrathecal injection and remitting within 14 days.
A. Any headache fulfilling criterion C
B. An intrathecal injection has been given
C. Evidence of causation demonstrated by at least two of the following:
1. headache has developed within 4 days of the intrathecal injection
2. headache has significantly improved within 14 days after the intrathecal injection
3. signs of meningeal irritation
D. Not better accounted for by another ICHD-3 diagnosis.
Headache usually develops within four days after intrathecal injection, and is present in both upright and recumbent postures.
When headache persists beyond 14 days, alternative diagnoses should be considered, such as 7.2.2 CSF fistula headache, meningitis or leptomeningeal disease.